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mp4.py
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mp4.py
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# mp4.py
#
# Copyright 2015, espes
#
# Licensed under GPL Version 2 or later
#
import struct
from construct import *
from construct_utils import *
import aac
# ISO/IEC 14496-1:2010
# Coding of audio-visual objects - Part 1: Systems
# 8.3.3
class InstanceLengthAdapter(Adapter):
def _encode(self, obj, context):
if obj >= 128:
raise NotImplemented
return [0x80, 0x80, 0x80, obj]
def _decode(self, obj, context):
size = 0
for v in obj:
size <<= 7
size |= v & 0b1111111
return size
InstanceLength = InstanceLengthAdapter(
RepeatUntil(lambda obj, ctx: (obj >> 7) == 0,
UBInt8("sizeOfInstance")))
# 7.2.6.14.3.4
def ByteArray(name):
return Struct(name,
InstanceLength,
String("data", this.sizeOfInstance))
def ExpandableTag(name, tags, *subcons):
tagcons = UBInt8("tag")
if isinstance(tags, int):
tagcons = Const(tagcons, tags)
elif tags is not None:
tagcons = OneOf(tagcons, tags)
if subcons:
datacons = Embed(TunnelAdapter(
Field("data", this.sizeOfInstance),
Struct(None, *subcons)))
else:
datacons = String("data", this.sizeOfInstance)
return Struct(name,
tagcons,
InstanceLength,
datacons)
# 7.2.2.2
def BaseDescriptor(name, tags, *subcons):
return ExpandableTag(name, tags, *subcons)
# 7.2.6.3
MP4_OD_Tag = 0x11
ObjectDescrTag = 0x01
ObjectDescriptor_data = Struct(None,
EmbeddedBitStruct(
Bits("ObjectDescriptorID", 10),
Flag("URL_Flag"),
Padding(5)), # reserved
Embed(IfThenElse(None, this.URL_Flag,
PascalString("URLstring", UBInt8("URLlength")),
Struct(None,
Range(1, 255, LazyBound("esDescr", lambda: ES_Descriptor)),
Range(0, 255, LazyBound("ociDescr", lambda: OCI_Descriptor)),
Range(0, 255, LazyBound("ipmpDescrPtr", lambda: IPMP_DescriptorPointer)),
Range(0, 255, LazyBound("ipmpDescr", lambda: IPMP_Descriptor))))),
Range(0, 255, LazyBound("extDescr", lambda: ExtensionDescriptor)))
ObjectDescriptor = BaseDescriptor("OD", ObjectDescrTag,
Embed(ObjectDescriptor_data))
# 7.2.6.4
MP4_IOD_Tag = 0x10
InitialObjectDescrTag = 0x2
InitialObjectDescriptor_data = Struct(None,
EmbeddedBitStruct(
Bits("ObjectDescriptorID", 10),
Flag("URL_Flag"),
Flag("includeInlineProfileLevelFlag"),
Padding(4)), # reserved
Embed(IfThenElse(None, this.URL_Flag,
PascalString("URLstring", UBInt8("URLlength")),
Struct(None,
UBInt8("ODProfileLevelIndication"),
UBInt8("sceneProfileLevelIndication"),
UBInt8("audioProfileLevelIndication"),
UBInt8("visualProfileLevelIndication"),
UBInt8("graphicsProfileLevelIndication"),
Range(0, 255, LazyBound("esDescr", lambda: ES_Descriptor)), # should be [1...255]??
Range(0, 255, LazyBound("ociDescr", lambda: OCI_Descriptor)),
Range(0, 255, LazyBound("ipmpDescrPtr", lambda: IPMP_DescriptorPointer)),
Range(0, 255, LazyBound("ipmpDescr", lambda: IPMP_Descriptor)),
Range(0, 255, LazyBound("toolListDescr", lambda: IPMP_ToolListDescriptor))))),
Range(0, 255, LazyBound("extDescr", lambda: ExtensionDescriptor)))
InitialObjectDescriptor = BaseDescriptor("IOD", InitialObjectDescrTag,
Embed(InitialObjectDescriptor_data))
# 7.2.6
ObjectDescriptorBase = BaseDescriptor("OD", (ObjectDescrTag, InitialObjectDescrTag),
Embed(Switch("OD", this.tag,
{ ObjectDescrTag: ObjectDescriptor_data,
InitialObjectDescrTag: InitialObjectDescriptor_data }, default=Bork())))
MP4_ObjectDescriptorBase = BaseDescriptor("OD", (MP4_OD_Tag, MP4_IOD_Tag),
Embed(Switch("OD", this.tag,
{ MP4_OD_Tag: ObjectDescriptor_data,
MP4_IOD_Tag: InitialObjectDescriptor_data }, default=Bork())))
# 7.2.6.9
ContentIdentDescrTag = 0x07
SupplContentIdentDescrTag = 0x08
IP_IdentificationDataSet = BaseDescriptor("ipIDS",
range(ContentIdentDescrTag, SupplContentIdentDescrTag+1))
# 7.2.6.12
IPI_DescrPointerTag = 0x09
IPI_DescrPointer = BaseDescriptor("ipiPtr", IPI_DescrPointerTag,
UBInt16("IPI_ES_Id"))
# 7.2.6.13
IPMP_DescrPtrTag = 0x0a
IPMP_DescriptorPointer = BaseDescriptor("ipmpDesrPtr", IPMP_DescrPtrTag)
# 7.2.6.14
IPMP_DescrTag = 0x0b
IPMP_Descriptor = BaseDescriptor("ipmpDescr", IPMP_DescrTag)
# 7.2.6.14.3.2
IPMP_ToolTag = 0x61
IPMP_Tool = BaseDescriptor("ipmpTool", IPMP_ToolTag)
# 7.2.6.14.3
IPMP_ToolsListDescrTag = 0x60
IPMP_ToolListDescriptor = BaseDescriptor("toolListDescr", IPMP_ToolsListDescrTag,
Range(0, 255, IPMP_Tool))
# 7.2.6.15
QoS_DescrTag = 0x0c
QoS_Descriptor = BaseDescriptor("qosDescr", QoS_DescrTag)
# 7.2.6.16
ExtDescrTagStartRange = 0x6a
ExtDescrTagEndRange = 0xfe
ExtensionDescriptor = BaseDescriptor("extDescr",
range(ExtDescrTagStartRange, ExtDescrTagEndRange+1))
# 7.2.6.17
RegistrationDescrTag = 0x0d
RegistrationDescriptor = BaseDescriptor("regDescr", RegistrationDescrTag)
# 7.2.6.18
OCIDescrTagStartRange = 0x40
OCIDescrTagEndRange = 0x5f
OCI_Descriptor = BaseDescriptor("ociDescr",
range(OCIDescrTagStartRange, OCIDescrTagEndRange+1))
# 7.2.6.18.6
LanguageDescrTag = 0x43
LanguageDescriptor = BaseDescriptor("langDescr", LanguageDescrTag,
Array(3, UBInt8("languageCode")))
# 7.2.6.20
DecSpecificInfoTag = 0x05
def DecoderSpecificInfo(objectTypeFunc=None):
if objectTypeFunc is None:
return BaseDescriptor("decSpecificInfo", DecSpecificInfoTag)
return BaseDescriptor("decSpecificInfo", DecSpecificInfoTag,
Switch("data", lambda ctx: objectTypeFunc(ctx._), {
0x40: aac.AudioSpecificConfig_bytes,
}, default=String("data", this.sizeOfInstance)))
# 7.2.6.20
ProfileLevelIndicationIndexDescrTag = 0x14
ProfileLevelIndicationIndexDescriptor = BaseDescriptor(
"profileLevelIndicationIndexDescriptor", ProfileLevelIndicationIndexDescrTag,
UBInt8("profileLevelIndicationIndex"))
# 7.2.6.6
DecoderConfigDescrTag = 0x04
DecoderConfigDescriptor = BaseDescriptor("decoderConfigDescr", DecoderConfigDescrTag,
EmbeddedBitStruct(
Bits("objectTypeIndication", 8),
Bits("streamType", 6),
Bits("upStream", 1),
Padding(1), #reserved
Bits("bufferSizeDB", 24)),
UBInt32("maxBitrate"),
UBInt32("avgBitrate"),
Optional(DecoderSpecificInfo(this.objectTypeIndication)),
Range(0, 255, ProfileLevelIndicationIndexDescriptor))
# 7.3.2.3
SLConfigDescrTag = 0x06
SLConfigDescriptor = BaseDescriptor("slConfigDescr", SLConfigDescrTag,
UBInt8("predefined"),
If(lambda ctx: ctx.predefined == 0,
Embed(Struct(None,
EmbeddedBitStruct(
Flag("useAccessUnitStartFlag"),
Flag("useAccessUnitEndFlag"),
Flag("useRandomAccessPointFlag"),
Flag("hasRandomAccessUnitsOnlyFlag"),
Flag("usePaddingFlag"),
Flag("useTimeStampsFlag"),
Flag("useIdleFlag"),
Flag("durationFlag"),
Bits("timeStampResolution", 32),
Bits("OCRResolution", 32),
Bits("timeStampLength", 8),
Bits("OCRLength", 8),
Bits("AU_Length", 8),
Bits("instantBitrateLength", 8),
Bits("degredationPriorityLength", 4),
Bits("AU_seqNumLength", 5),
Bits("packetSeqNumLength", 5),
Padding(2)), #reserved
If(this.durationFlag,
Embed(Struct(None,
UBInt32("timeScale"),
UBInt16("accessUnitDuration"),
UBInt16("compositionUnitDuration")))),
If(lambda ctx: not ctx.useTimeStampsFlag,
Bits("startDecodingTimeStamp", this.timeStampLength),
Bits("startCompositionTimeStamp", this.timeStampLength))))))
# 7.2.6.5
ES_DescrTag = 0x03
ES_Descriptor = BaseDescriptor("ES", ES_DescrTag,
UBInt16("ES_ID"),
EmbeddedBitStruct(
Flag("streamDependenceFlag"),
Flag("URL_Flag"),
Flag("OCRstreamFlag"),
Bits("streamPriority", 5)),
If(this.streamDependenceFlag,
UBInt16("dependsOn_ES_ID")),
If(this.URL_Flag,
PascalString("URLstring", UBInt8("URLlength"))),
If(this.OCRstreamFlag,
UBInt16("OCR_ES_Id")),
DecoderConfigDescriptor,
SLConfigDescriptor,
Optional(IPI_DescrPointer),
Range(0, 255, IP_IdentificationDataSet),
Range(0, 255, IPMP_DescriptorPointer),
Range(0, 255, LanguageDescriptor),
Optional(QoS_Descriptor),
Optional(RegistrationDescriptor),
Range(0, 255, ExtensionDescriptor))
# ISO/IEC 14496-12:2012
# Coding of audio-visual objects - Part 12: ISO base media file format
box_data = {}
def make_box(fourcc=None):
typeCons = String("type", 4)
if fourcc:
typeCons = Const(typeCons, fourcc)
return StructWithLength(fourcc or "box",
UBInt32("size"),
Anchor("_box_start"),
typeCons,
# If(lambda ctx: ctx.size == 1,
# UBInt64("largesize")),
If(lambda ctx: ctx.type == 'uuid',
String("usertype", 16)),
Anchor("_header_end"),
ParseOnly(Value("data_size",
lambda ctx: ctx.size - 4 - (ctx._header_end - ctx._box_start))),
Probe("box", show_stream=False, show_stack=False),
Switch("data", this.type, box_data, default=Bork("unimplemented box")),
OptionalGreedyRange(LazyBound("children", lambda: Box)),
Terminator,
inclusive=True)
Box = make_box()
def define_box(fourcc, datacons=None):
if datacons:
box_data[fourcc] = Rename(fourcc, datacons)
else:
box_data[fourcc] = Struct(fourcc)
return make_box(fourcc)
def BaseBox(*subcons):
return Struct(None, *subcons)
# 4.2
def FullBox(*subcons):
return Struct(None,
UBInt8("version"),
UBInt24("flags"),
*subcons)
# 4.3
FileTypeBox = define_box("ftyp",
BaseBox(
String("major_brand", 4),
UBInt32("major_brand_version"),
OptionalGreedyRange(String("compatible_brands", 4))))
# 8.1
MediaDataBox = define_box("mdat",
OnDemand(Field("data", this.data_size)))
# 8.1.2
FreeSpaceBox = define_box("free",
Padding(this.data_size))
# 8.2.1
MovieBox = define_box("moov")
# 8.2.2
MovieHeaderBox = define_box("mvhd",
FullBox(
Embed(IfThenElse(None, lambda ctx: ctx.version == 1,
Struct(None,
UBInt64("creation_time"),
UBInt64("modification_time"),
UBInt32("timescale"),
UBInt64("duration")),
Struct(None,
UBInt32("creation_time"),
UBInt32("modification_time"),
UBInt32("timescale"),
UBInt32("duration")))),
UBInt32("rate"),
UBInt16("volume"),
Padding(2), #reserved
Padding(8), #reserved
Array(9, UBInt32("matrix")),
Padding(6*4), #pre_defined
UBInt32("next_track_id")))
# 8.3.1
TrackBox = define_box("trak")
# 8.3.2
TrackHeaderBox = define_box("tkhd",
FullBox(
Embed(IfThenElse(None, lambda ctx: ctx.version == 1,
Struct(None,
UBInt64("creation_time"),
UBInt64("modification_time"),
UBInt32("track_id"),
Padding(4), #reserved
UBInt64("duration")),
Struct(None,
UBInt32("creation_time"),
UBInt32("modification_time"),
UBInt32("track_id"),
Padding(4), #reserved
UBInt32("duration")))),
Padding(8), #reserved
UBInt16("layer"),
UBInt16("alternate_group"),
UBInt16("volume"),
Padding(2), #reserved
Array(9, UBInt32("matrix")),
UBInt32("width"),
UBInt32("height")))
# 8.4.1
MediaBox = define_box("mdia")
# 8.4.2
MediaHeaderBox = define_box("mdhd",
FullBox(
Embed(IfThenElse(None, lambda ctx: ctx.version == 1,
Struct(None,
UBInt64("creation_time"),
UBInt64("modification_time"),
UBInt32("timescale"),
UBInt64("duration")),
Struct(None,
UBInt32("creation_time"),
UBInt32("modification_time"),
UBInt32("timescale"),
UBInt32("duration")))),
EmbeddedBitStruct(
Padding(1),
Array(3, Bits("language", 5))),
Padding(2))) #pre_defined
# 8.4.3
HandlerBox = define_box("hdlr",
FullBox(
Padding(4), #pre_defined
String("handler_type", 4),
Padding(3*4), #reserved
CString("name")))
# 8.4.4
MediaInformationBox = define_box("minf"),
VideoMediaHeaderBox = define_box("vmhd",
FullBox(
UBInt16("graphicsmode"),
Array(3, UBInt16("opcolor"))))
# 8.4.5.3
SoundMediaHeaderBox = define_box("smhd",
FullBox(
UBInt16("balance"),
Padding(2))) #reserved
# 8.5.1
SampleTableBox = define_box("stbl")
# 8.5.2
SampleDescriptionBox = define_box("stsd",
FullBox(
PrefixedArray(
Rename("entry", Box), # TODO
UBInt32("entry_count"))))
# 8.5.2.2
def SampleEntry(*subcons):
return Struct(None,
Padding(6), #reserved
UBInt16("data_reference_index"),
*subcons)
PixelAspectRatioBox = define_box("pasp",
BaseBox(
UBInt32("hSpacing"),
UBInt32("vSpacing")))
CleanApertureBox = define_box("clap",
BaseBox(
UBInt32("cleanApertureWidthN"),
UBInt32("cleanApertureWidthD"),
UBInt32("cleanApertureHeightN"),
UBInt32("cleanApertureHeightD"),
UBInt32("horizOffN"),
UBInt32("horizOffD"),
UBInt32("vertOffN"),
UBInt32("vertOffD")))
def VisualSampleEntry(*subcons):
return SampleEntry(
Padding(2), #pre_defined
Padding(2), #reserved
Padding(4*3), #pre_defined
UBInt16("width"),
UBInt16("height"),
UBInt32("horizresolution"),
UBInt32("vertresolution"),
Padding(4), #reserved
UBInt16("frame_count"),
String("compressorname", 32, padchar="\x00"),
UBInt16("depth"),
Padding(2), #pre_defined
*(subcons + (
Optional(CleanApertureBox),
Optional(PixelAspectRatioBox)
)))
def AudioSampleEntry(*subcons):
return SampleEntry(
Padding(8), #reserved
UBInt16("channelcount"),
UBInt16("samplesize"),
Padding(2), #pre_defined
Padding(2), #reserved
UBInt32("samplerate"),
*subcons)
# 8.6.1.2
TimeToSampleBox = define_box("stts",
FullBox(
PrefixedArray(
Struct("sample_entry",
UBInt32("sample_count"),
UBInt32("sample_delta")),
UBInt32("entry_count"))))
# 8.6.2
SyncSampleBox = define_box("stss",
FullBox(
PrefixedArray(
UBInt32("sample_number"),
UBInt32("entry_count"))))
# 8.6.5
EditBox = define_box("edts")
# 8.6.6
EditListBox = define_box("elst",
FullBox(
UBInt32("entry_count"),
Array(this.entry_count,
Struct('entry',
Embed(IfThenElse(None, lambda ctx: ctx._.version == 1,
Struct(None,
UBInt64("segment_duration"),
UBInt64("media_time")),
Struct(None,
UBInt32("segment_duration"),
UBInt32("media_time")))),
UBInt16("media_rate_integer"),
UBInt16("media_rate_fraction")))))
# 8.7.1
DataInformationBox = define_box("dinf")
# 8.7.2
DataEntryUrlBox = define_box("url ",
FullBox(
Optional(CString("location"))))
DataEntryUrnBox = define_box("urn ",
FullBox(
CString("name"),
Optional(CString("location"))))
DataReferenceBox = define_box("dref",
FullBox(
PrefixedArray(
Rename("data_entry", Box), #TODO
UBInt32("entry_count"))))
# 8.7.3.2
SampleSizeBox = define_box("stsz",
FullBox(
UBInt32("sample_size"),
UBInt32("sample_count"),
If(lambda ctx: ctx.sample_size == 0,
OnDemand(Array(this.sample_count,
UBInt32("sample_size_list"))))))
# 8.7.4
SampleToChunkBox = define_box("stsc",
FullBox(
PrefixedArray(
Struct("sample_entry",
UBInt32("first_chunk"),
UBInt32("samples_per_chunk"),
UBInt32("sample_description_index")),
UBInt32("entry_count"))))
# 8.7.5
ChunkOffsetBox = define_box("stco",
FullBox(
PrefixedArray(
UBInt32("chunk_offset"),
UBInt32("entry_count"))))
# 8.10.1
UserDataBox = define_box("udta")
# 8.11.1
MetaBox = define_box("meta",
FullBox(
LazyBound("theHandler", lambda: HandlerBox),
# TODO
OptionalGreedyRange(Rename("other_boxes", Box))))
# ISO/IEC 14496-14:2003
# Coding of audio-visual objects - Part 14: MP4 file format
# 5.1
ObjectDescriptorBox = define_box("iods",
FullBox(MP4_ObjectDescriptorBase))
# 5.6
ESDBox = define_box("esds", FullBox(ES_Descriptor))
MP4AudioSampleEntry = define_box("mp4a",
AudioSampleEntry(Rename("ES", ESDBox)))
# ISO/IEC 14496-15:2014
# Coding of audio-visual objects
# Part 15: Carriage of NAL unit structured video in ISO base media file format
# 5.3.3.1
AVCDecoderConfigurationRecord = Struct("avcC",
UBInt8("configurationVersion"),
UBInt8("AVCProfileIndication"),
UBInt8("profile_compatibility"),
UBInt8("AVCLevelIndication"),
EmbeddedBitStruct(
Padding(6), #reserved
Bits("lengthSizeMinusOne", 2),
Padding(3), #reserved
Bits("numOfSequenceParameterSets", 5)),
Array(this.numOfSequenceParameterSets,
PascalString("sequenceParameterSetNALUnit",
UBInt16("sequenceParameterSetLength"))),
PrefixedArray(
PascalString("pictureParameterSetNALUnit",
UBInt16("pictureParameterSetLength")),
UBInt8("numOfPictureParameterSets")),
If(lambda ctx: ctx.AVCProfileIndication in (100, 110, 122, 144),
Optional(Struct("ext",
EmbeddedBitStruct(
Padding(6), #reserved
Bits("chroma_format", 2),
Padding(5), #reserved
Bits("bit_depth_luma_minus8", 3),
Padding(5), #reserved
Bits("bit_depth_chromw_minus8", 3)),
PrefixedArray(
PascalString("sequenceParameterSetExt",
UBInt16("sequenceParameterSetExtLength")),
UBInt8("numOfSequenceParameterSetExt"))))))
# 5.4.2.1
AVCConfigurationBox = define_box("avcC",
BaseBox(AVCDecoderConfigurationRecord))
MPEG4BitRateBox = define_box("btrt",
BaseBox(
UBInt32("bufferSizeDB"),
UBInt32("maxBitrate"),
UBInt32("avgBitrate")))
MPEG4ExtensionDescriptorsBox = define_box("m4ds",
BaseBox(
Range(0, 255, BaseDescriptor("descr", None))))
AVCSampleEntry = define_box("avc1",
VisualSampleEntry(
AVCConfigurationBox,
Optional(MPEG4BitRateBox),
Optional(MPEG4ExtensionDescriptorsBox)))
# derp
IlstBox = define_box("ilst", BaseBox(Padding(this._.data_size)))
MP4 = GreedyRange(Box)
def mux_aac_eld(channels, sample_rate, sample_size, frame_duration, frames):
# ftyp 4.3 File Type
# moov 8.2.1 Movie
# mvhd 8.2.2 Movie Header
# trak 8.3.1 Track
# tkhd 8.3.2 Track Header
# mdia 8.4.1 Media
# mdhd 8.4.2 Media Header
# hdlr 8.4.3 Handler Reference
# minf 8.4.4 Media Information
# smhd 8.4.5.3 Sound Media Header
# dinf 8.7.1 Data Information
# dref Data Reference ...
# stbl 8.5.1 Sample Table
# stsd 8.5.2 Sample Description
# mp4a
# esds
# stts 8.6.1.2 Decoding Time to Sample
# stsc 8.7.4 Sample To Chunk
# stsz? 8.7.3.2 Sample Size
# stco 8.7.5 Chunk Offset - Index of each chunk into the file
assert frame_duration in (512, 480)
# sample_rate in hz
# sample_size in bits
# frame_duration in samples
duration = 1000 * frame_duration * len(frames) / sample_rate # in ms
ftyp = DefaultingContainer(
type = 'ftyp',
data = Container(
major_brand = 'M4A ',
major_brand_version = 512,
compatible_brands = ['isom', 'iso2']),
children = [])
mvhd = DefaultingContainer(
type = 'mvhd',
data = Container(
version = 0,
flags = 0,
creation_time = 0,
modification_time = 0,
timescale = 1000,
duration = duration,
rate = 6, # wtf
volume = 0x100,
matrix = [
0x10000, 0, 0,
0, 0x10000, 0,
0, 0, 0x40000000
],
next_track_id = 2),
children = [])
audioSpecificConfig = Container(
audioObjectType = 39, # AAC-ELD
samplingFrequency = sample_rate,
channelConfiguration = channels,
extensionConfig = None,
config = Container(
frameLengthFlag = frame_duration == 480,
aacSectionDataResilienceFlag = False,
aacScalefactorDataResilienceFlag = False,
aacSpectralDataResilienceFlag = False,
ldSbrPresentFlag = False,
ld = None,
eldext = [Container(eldExtType=0)]),
ep = Container(epConfig = 0),
remaining = [0, 0])
esds = DefaultingContainer(
type = 'esds',
data = Container(
version = 0,
flags = 0,
ES = Container(
tag = 3, # ES_DescrTag
sizeOfInstance = 36,
ES_ID = 1,
streamDependenceFlag = False,
URL_Flag = False,
OCRstreamFlag = False,
streamPriority = 0,
dependsOn_ES_ID = None,
URLstring = None,
OCR_ES_Id = None,
decoderConfigDescr = Container(
tag = 4, # DecoderConfigDescrTag
sizeOfInstance = 22,
objectTypeIndication = 0x40, # Audio ISO/IEC 14496-3
streamType = 5,
upStream = 0,
bufferSizeDB = 0,
maxBitrate = 0,
avgBitrate = 0,
decSpecificInfo = Container(
tag = 5, # DecSpecificInfoTag
sizeOfInstance = 4,
data = audioSpecificConfig),
profileLevelIndicationIndexDescriptor = []),
slConfigDescr = Container(
tag = 6, # SLConfigDescrTag
sizeOfInstance = 1,
predefined = 2),
ipiPtr = None,
ipIDS = [],
ipmpDesrPtr = [],
langDescr = [],
qosDescr = None,
regDescr = None,
extDescr = [])),
children = [])
mp4a = DefaultingContainer(
type = 'mp4a',
data = Container(
data_reference_index = 1,
channelcount = channels,
samplesize = sample_size,
samplerate = sample_rate << 16,
ES = esds),
children = [])
stsd = DefaultingContainer(
type = 'stsd',
data = Container(
version = 0,
flags = 0,
entry = [ mp4a ]),
children = [])
stts = DefaultingContainer(
type = 'stts',
data = Container(
version = 0,
flags = 0,
sample_entry = [
Container(
sample_count = len(frames),
sample_delta = frame_duration)
]),
children = [])
stsc = DefaultingContainer(
type = 'stsc',
data = Container(
version = 0,
flags = 0,
sample_entry = [
Container(
first_chunk = 1,
samples_per_chunk = len(frames),
sample_description_index = 1)
]),
children = [])
stsz = DefaultingContainer(
type = 'stsz',
data = Container(
version = 0,
flags = 0,
sample_size = 0,
sample_count = len(frames),
sample_size_list = map(len, frames)),
children = [])
stco = DefaultingContainer(
type = 'stco',
data = Container(
version = 0,
flags = 0,
chunk_offset = [
0xff998877, # hax
]),
children = [])
minf = DefaultingContainer(
type = 'minf',
children = [
DefaultingContainer(
type = 'smhd',
data = Container(
version = 0,
flags = 0,
balance = 0),
children = []),
DefaultingContainer(
type = 'dinf',
children = [
DefaultingContainer(
type = 'dref',
data = Container(
version = 0,
flags = 0,
data_entry = [
DefaultingContainer(
type = 'url ',
data = Container(
version = 0,
flags = 1,
location = None),
children = [])
]),
children = [])
]),
DefaultingContainer(
type = 'stbl',
children = [
stsd,
stts,
stsc,
stsz,
stco
])
])
mdia = DefaultingContainer(
type = 'mdia',
children = [
DefaultingContainer(
type = 'mdhd',
data = Container(
version = 0,
flags = 0,
creation_time = 0,
modification_time = 0,
timescale = sample_rate, # wtf
duration = frame_duration * len(frames),
language = [ 21, 14, 4 ]),
children = []),
DefaultingContainer(
type = 'hdlr',
data = Container(
version = 0,
flags = 0,
handler_type = 'soun',
name = 'SoundHandler'),
children = []),
minf
])
trak = DefaultingContainer(
type = 'trak',
children = [
DefaultingContainer(
type = 'tkhd',
data = Container(
version = 0,
flags = 3,
creation_time = 0,
modification_time = 0,
track_id = 1,
duration = duration,
layer = 0,
alternate_group = 1,
volume = 0x100,
matrix = [
0x10000, 0, 0,
0, 0x10000, 0,
0, 0, 0x40000000
],
width = 0,
height = 0),
children = []),
mdia
])
moov = DefaultingContainer(
type = 'moov',
children = [
mvhd,
trak
])
header = MP4.build([ftyp, moov])
# print header.encode("hex")
# print len(header)
# hax
header = header.replace("\xFF\x99\x88\x77", struct.pack(">I", len(header)+8))
data = ''.join(frames)
mdat = Box.build(DefaultingContainer(
type = 'mdat',
data_size = len(data),
data = data,
children = []))
open("/tmp/tmp.m4a", "a").write(header+mdat)
def extract_samples(file_name):
f = open(file_name, "rb")
r = MP4.parse_stream(f)
def find_box(t, n=r):
if isinstance(n, list):
for c in n:
v = find_box(t, c)
if v is not None: return v
return None
if n.type == t: return n
for c in n.children:
v = find_box(t, c)
if v is not None: return v
return None
# stts = find_box('stts')
stsc = find_box('stsc')
stco = find_box('stco')
stsz = find_box('stsz')
sample_sizes = stsz.data.sample_size_list.read()
chunk_samples = []
for c in stsc.data.sample_entry:
while len(chunk_samples) < c.first_chunk-1:
chunk_samples.append(chunk_samples[-1])
chunk_samples.append(c.samples_per_chunk)
while len(chunk_samples) < len(stco.data.chunk_offset):
chunk_samples.append(chunk_samples[-1])
samples = []
j = 0
for i, s in enumerate(chunk_samples):
offset = stco.data.chunk_offset[i]
for k in xrange(j, j+s):
sample_size = sample_sizes[k]
samples.append(d[offset:offset+sample_size])
offset += sample_size
j += s
return samples